Jack



, mmm@ R. N. MILLER JACK Filed May 20. 1921 4 Sheets-Sheet 1 @et 9, i923.,

31a/uen* of,

@from Filed May 20.

R. N. MILLER JACK Mmm@

1921 4 Sheets-Sheet 2 wm. 9, w23. mm1

R. N. MILLER JACK Filed May 20. 1921 4 Sheets-Sheet 5 @g1g 5g/Mme WM 61H01 mm3 R. N. MILLER JACK 4 sheets-sheet 4 Filed May 20, 1921 Patented @et 9, 1923.

PATET ROBERT N. MILLER, OF ALTOONA, PENNSYLVANIA.

.1' ACK.

Application led May 20,

To all whom 'it may concern:

Be it known that 1. ROBERT N. MILLER, a citizen of the United States, and residing at Altoona, Blair County, State of Pennsyl- Vania, have invented certain newv and useful improvements in Jacks, of which the following is a specification.

The present invention relates to jacks and particularly to power jacks adapted to be used in removing, for the purpose of repair or replacement, the wheels and axles of railway cars and locomotives.

1t is often necessary, in making repairs, to remove a pair of wheels with their conv necting axle from a car or locomotive, and for this purpose railroad machine shops and locomotive round houses have been provided with trackways which `bridge across pits sunk below the floor level into which the wheels have' been increased to such an extent that fit is a difficult undertaking to re move an axle with two steel wheels, one

fixed on each end thereof, and an operation hazardous to the workmen positioned in the p lt is the object of the present invention to provide a jack to be used particularly in suoli operations which liack is permanently located in the pit beneath a traekway and is 'operable from the ground surface to lower an axle and its associated wheels into the pit and to then convey the same along a trackway to one side of the car or loco-motive to a position where it is accessible from above so that it may be lifted by means of a crane. The jack screwelevating gear is positioned on a wheeled platform and means is provided for propelling the platform along the trackway at the bottom of the pit, which means is controlled from the ground level. As the elevating gear is also controlled from the ground level it is unnecessary for a workman to descend into the pit to operate'the jack and to thereby become exposed to great danger due to slip-` ping of the jack or falling of the wheels or other-portions of the ear or *locomotive above his head. rThe jack operates quickly 1921. Serial No. 471,135.

and enables the repair to be made in a mininiun'i of time as well as being instrumental in preventing injury to the person` nel of the repair force.

An important feature of the invention resides in the complete enclosure of the moving parts of the elevating gear within a fluid tight casing which is normally lilled with oil, the elevating screw and gear wheel operating the same running in oil at all times. Other features of the invention re side in the arrangement of the parts of the apparatus whereby a quick acting jack is provided as well as one which is sturdy, and in which the parts are positioned in such a manner that the ack is well balanced. One form of the invention is illustrated in the accompanying drawings in which:

Figure 1 is a plan view of a portion of the floor of a round house or repair shop showing atrackway yfor rolling stock, a pit under the trackway, and the improved `iack in the pli; l

Figure 2 is a section on line 2-2 of Figure 1 showing the jack positioned beneath the axle of a car or locomotive;

Figure 3 is a. plan view of the jack on a larger scale; and,

Figure 4 is a side view of the same partly broken away to show the elevating mechanism. I

Referring particularly to Figures 8 and 4, it will be seen that the jack comprises an elevating screw 10 which is externally threaded and extends through a threaded central aperture in a worin wheel 11 which is rotatably supported within a chamber' 12 of a pedestal 13 mounted upon a platform 14, the pedestal being preferably of cast iron. LThe platform in turn is supported on wheels 15 which run on rails 16 extending longitudinally of the pit. A worm 17 is also positioned within the fluid tight chamber 12 and this `worm meshes with worm wheel 11 to rotate the same about the axis of the screw 10 to raise or lower the latter. llorm 17 is connected by a chain` or belt 18 to an electric motor 19 rigidly secured to the truck frame and by reversibly operating this "motor the screw may be raised or 'lowered as desired.

The screw 10 projects downwardly axially through the supporting pedestal 13 and exthe screw 10, worm wheel 11, and worin 1T opposite that ugon which the motor 19 is positends downwardly through an aperture in the truck frame for a considerable distance, as shownin Figure 2, the screw being eliclosed within a fluid tight casing which 5v opens atits upper endl linto the chainber 12.-`

Oil or grease may be introduced through aperture 21 into chamber 12 from where it will find its way into -andt will lillthe cas--y ing 20 so that in the operation of the jack,

'- vv-is Connected by abelt or chain 23 with short truck. frame.

continually run in: oil or grease, thereby.,4 reducing the wear and frictional losses to a minimum.

Mounted upon Ithe end of the truck its. top n. into such position that the upper edges of the iianges of the wheels are below the beams 32. r .The propelling motor 22 may -then be operatedito miovethe: acloand aXle laterally alongthe trackway 17 from@ posi- =tion1-beneath the car oralocomotive to a positionwhere the aXle is accessible from above'. The screw maythenbe-| elevated if desired and rails-.placed under. the,` wheels frame tioned is a second motor 22,-the shaft ofwhich shaft 24 extending longitudinally, of the The shaft-21l has aworm 25 20 thereon which is in mesh ywith a worm wheel 01a the Wheels ,may ha, lifted from-the jack 2,5-Chainst18and 23 areboth enclosed withinte,1

- fprotectivecas-ings to 'prevent l injury .or dis: nplacement thereof and to keep outr dustand 2.6. rigid with theJ adjacent Saule; of the machine. The motorv22 may be driven in eitherfdirection and the jack thereby profl pelled in either direction along the trackway.

ltiytmeans ofv a crane. v`For,convenience in inspecting and manipulating ethe wheels the ."cap 35.- of the screwis pivoted. thereonso that the axle maybe swung inra horizontal, plane. From `'ther above -descriptionf the nature ofthef invention willbe apparent to those skilled y.in the art and'it wilhbe Obvious grit. 1 that changes in-fthedesign andar-rangement i In Figures 1 and 2 the leads-from the elec-,0152 the panel-maybe made without, .departtric motors are diagrammatically illustrated. ing therefrom,

Lln actual. practice they willpass through an( 1: Having thus described theinvention what i extensible Vcable to anf outletiboXVZY -in'ithe L claimas new .andLdesire-.to@secure by sidewall ofut'he` pit? and thence pass up-dLQtterg Patent is: WM'CUy t0 4the fOOl'f level., Individual Ie- 1. Inl a jack ofthe class described, in

versing switches for controlling` themo'OIS combination, a 'wheeled platformwhaving V- 'are SllOWIL'Il Figure 1, the switch' diagram-f. a:central :vertical aperture therethrough, a matically illustrated at 28v controlling the, tubular.'casing secured tothepl'atform and circuit through i the motor for elevating: extendiue'yertically downwardley7 therefrom, the screw and t-he switchillustrated dlasaidcasing` being fcoaxialfwithftheuapertur@ 40 l'rmmltmluy at QQ-COUTOHUIJS th@ 'circuit riuwthe platfornuaud. having' its lower end iii The yoperator str ind-ing a-tl-i:,lie edge oli mounted on the top of the platform and the pit, erin any suitable position-td observen arrangedfcoaxially with lisaid i aperture and thefposition ofuthe `Vaclnunay eompletelyi casing, said'fpedestalhaving'anvannulalr i 115 f control itsoperat-ion by means of these two` bearing,fan internally threaded wheel rotatswitches. By operating switch 29 he mayy ably 'mounted on said shouldenwmeans move the jack until the screw isveXactly mounted-on the 'platform for .irotating said Y underthe middle pointwofithelaxle and 'by vgear wheel ineither direction, and aivertical oi'ienatingjthe switch 29 he may the-n raise... vscrew havingthreaded:)engagement with;

l the screw until its upper end engages the said gearaand normally extendinginto said -f over the center line ofi thle-traclway below,

axle, asrshown-v infdotted lines in Figure 2, casing-the screw being adapted to be; raised To reniiofve an axle, the car olf-locomotive is yorflowered by rotation of said gear, for the i moved until that particular axleisdireetly purpose setforth. l

2. lu al jack of the class described, in

' 55 that ispintolthef position oceupiednby the combination,- -awwheeled Aplatform lhaving a azul'e .i'nf'iFigure 2. f Thejac'kis then elef :central vertical aperture therethrough, a vatedunto dotted line position (Figure-@2)- isubstantially cylindrical x.pedestal Vmounted the elevation continuing until ithe wheels on the top ofthe platformanduarranged f' are lifted a slightdistance fromt-he traclrs--coaxially with: thewaperture, Vsaid ypedestal E 00 `The vpair of -wheelsfis then Vfreed fromifthe r havingy an [annular bearing, an internally uf. ,sin

`'rail sections-31 which are short and v-extemgl-` threaded wheelirotatablyi mountedfon said :only from'wallf to wallofwthe Lpit,-removed ishoulder, means-mounted on, theiplatform from under the wheeler',,Thesezrailisections' for@ rotating the wheelin either;y direction, ands-the: beamss-32 :upon which-:they are `sup-.,:sanvertical screw vhaving threaded Yengage -,portedzzlar'e .normally heldiagainstilateralmentlwith said wheel andfnormallyjextendlower the screw and the aXle balanced on ing through the aperture in the platform and below the same, and a cyhndrcal tube extendlng through sald aperture and Secured to the platform7 which tube extends downwardly and upwardly from the platform enclosing and constituting an Oil Chamber for the screw, the lower end of the tube In testimony whereof I hereuntoy alX my signature.

ROBERI` N. MILLER., 

